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Old 04-07-2010, 10:21 AM
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Transfer Case Fluid - What to USE??

I had to remove the transfer case and transmission on my 2004 F150 in order to replace the flexplate. I need to refill the transfer case (drained prior to removing) and saw that the Ford manual recommends Motorcraft XL-12 which can be had for $15.00 /quart at the dealer . . . . XL-12 is hard to find anywhere else. The parts guy at one of the dealers looked it up and said to use Mercon V ATF fluid. So should I use the XL-12 or the ATF fluid??

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Old 04-07-2010, 10:47 AM
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Any Mercon V compatible ATF is fine, I'd personally use a synthetic.
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Old 04-07-2010, 11:22 AM
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Thanks - Do I need to worry about any residual fluid still in the transfer case? I guess I could ensure it was completely drained before I re-installed it.

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Old 04-07-2010, 08:23 PM
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Transfer case is far from critical - just drain it till it stops dripping.
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Old 04-08-2010, 10:21 AM
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Any fully synthetic ATF meeting Mercon V specs is an acceptable fluid.
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Old 04-08-2010, 12:24 PM
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It doesn't even have to be fully synthetic.
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Old 04-08-2010, 07:13 PM
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My 02 Transfer Case is supposed to have Mercon, not Mercon V according to the owner's manual. I'm not sure why Ford would recommend Mercon for the Transfer case and Mercon V for the trans. Since the trans can leak Mercon V into the transfer case, I can't imagine it would make much difference to put Mercon V in the transfer case.
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Old 04-08-2010, 07:30 PM
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Mercon V is the back spec for your TC.
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Old 05-08-2010, 09:21 AM
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helpful here.
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